What is the most common mineral in the earths crust? why? what hazards are associated with it?

Quartz

Explanation:

Quartz is the most abundant mineral on the earth crust. From sedimentary rocks through igneous and metamorphic rocks, the mineral abounds. Also, a large amount of quartz makes up sand particles in soils.

Quartz is a frameworks silicate mineral formed by interlocking silica grains. It is highly abundant in different forms on the surface of the earth.

Quartz is a safe mineral because it causes not hazard to the environment and life. It is widely used in filter beds for water purification, for construction and making glasswares.

there's multiple reasons why the conquistadors were so successful in colonizing central america, and some of them are:

- they were seen as gods;

at the beginning, the spanish settlers were seen by the natives as gods, and this was mainly due to their white skin, and the way they came with their boats.

- possessed superior weaponry;

the spanish had gunpowder and guns, as well as cannons, while the natives did not had any fire weapons.

- made cleaver alliances;

they used the situation of tribes hating each other, so they made alliances with some of them which served them very well.

- brought diseases;

the native people were not immune to certain diseases the europeans brought with them, so they were dying from seeming harmless things for european standards.

because the center-south is called the heart of the country